a trait, manner, characteristic, or habit that is odd or unusual.

oddity; singularity; eccentricity.

a distinguishing quality or characteristic.

the quality or condition of being peculiar.

noun

normality , usualness

noun

abnormality , affectation , attribute , bizarreness , character , distinctiveness , eccentricity , feature , foible , freakishness , gimmick , idiosyncrasy , kink * , mannerism , mark , odd trait , particularity , property , quality , queerness , quirk , savor , schtick , singularity , slant * , specialty , trait , twist * , unusualness , characteristic , quirkiness , crotchet , kink , oddity , oddness , stamp , twist